<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0"/>
<style>
body {
    font-family:"Lucida Sans", Verdana, sans-serif;
}

.main img {
    width:100%;
}

h1{
    font-size:1.625em;
}

h2{
    font-size:1.375em;
}

.header {
    padding:20px;
    background-color:#f1f1f1;
}

.menuitem {
    margin:4.310344827586206896551724137931%;
    margin-left:0;
    margin-top:0;
    padding:4.310344827586206896551724137931%;
    border-bottom:1px solid #e9e9e9;
    cursor:pointer;
}

.main {
    padding:2.0661157024793388429752066115702%;
}

.right {
    padding:4.310344827586206896551724137931%;
    background-color:#CDF0F6;
}

.footer {
    padding:1.0121457489878542510121457489879%;
    text-align:center;
    background-color:#f1f1f1;
    font-size:0.625em;
}

.gridcontainer {
	width:100%;
}

.gridwrapper {
	overflow:hidden;
}

.gridbox {
    margin-bottom:2.0242914979757085020242914979757%;
    margin-right: 2.0242914979757085020242914979757%;
    float:left;
}

.gridheader {
    width:100%;
}

.gridmenu {
    width:23.481781376518218623481781376518%;
}

.gridmain {
    width:48.987854251012145748987854251012%;
}

.gridright {
    width:23.481781376518218623481781376518%;
    margin-right:0;
}

.gridfooter {
    width:100%;
    margin-bottom:0;
}

@media only screen and (max-width: 500px) {
    .gridmenu {
        width:100%;
    }

    .menuitem {
        margin:1.0121457489878542510121457489879%;
        padding:1.0121457489878542510121457489879%;
    }

    .gridmain {
        width:100%;
    }

    .main {
        padding:1.0121457489878542510121457489879%;
    }

    .gridright {
        width:100%;
    }

    .right {
        padding:1.0121457489878542510121457489879%;
    }

    .gridbox {
        margin-right:0;
        float:left;
    }
}
	</style>
	</head>
	<body>
<div class="gridcontainer">

    <div class="gridwrapper">
        <div class="gridbox gridheader">
            <div class="header">
                <h1>NLT</h1>
            </div>
        </div>
        
        
        <div class="gridbox gridmenu">
            <div class="menuitem">主页</div>
            <div class="menuitem">文章管理</div>
            <div class="menuitem">简报</div>
            <div class="menuitem">客户管理</div>
        </div>
        
        <div class="gridbox gridmain">
            <div class="main">
	          <h1>中间部分</h1>
	            <img src="img/16.jpg" alt="Pulpit rock" width="" height="">
	        </div>
	    </div>
	    <div class="gridbox gridright">
	            <div class="right">
					<h2>右边</h2>
	            </div>
	    </div>
	    <div class="gridbox gridfooter">
	            <div class="footer">
	               <p>CopyRight</p>
	            </div>
	    </div>
	</div>
	    
</div>
	</body>
	</html>
